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Antonio P. Brusamarello Paulo H. Oliveira Michelangelo M. Trezzi Taciane Finatto Fortunato D. B. Pagnoncelli Jr Ribas A. Vidal 《Weed Research》2020,60(4):278-286
Euphorbia heterophylla populations endued with resistance to both imazethapyr (an acetolactate synthase inhibitor) and fomesafen (a protoporphyrinogen oxidase inhibitor) were first detected in Brazil in 2004. The objectives of this study were to determine the number and dominance of genes conferring imazethapyr and fomesafen resistance in E. heterophylla and to establish the types of inheritance of the resistance traits. It was hypothesised that two dominant nuclear genes control this herbicide resistance and each gene confers resistance to a single herbicide. We crossed a susceptible (S) and a multiple-resistant (R) E. heterophylla biotype and generated F1 families which, in turn, were self-fertilised to produce F2 families. Backcrosses of the F1 families with the S- and R parental biotypes resulted in BCs and BCr families respectively. The F1, F2, BCs and BCr families and the S and R parental biotypes were subjected to imazethapyr and fomesafen wherein each herbicide was used as a selecting agent. F1 plants and the S- and R parental biotypes were used to evaluate the dominance of the resistance trait in multiple-dose bioassays with imazethapyr and fomesafen. The observed frequencies of resistant plants in the F1, F2, BCs and BCr families did not significantly differ from the expected frequencies for a resistance trait regulated by two dominant genes in which each gene confers resistance to a single herbicide. The lack of difference in herbicide response between the F1 family and the R parental biotype was taken as evidence for completely dominant resistance to imazethapyr and fomesafen. Herbicide resistance in E. heterophylla presents with dominant monogenic nuclear inheritance for each herbicide mode of action. Our findings underscore the necessity and urgency of adopting integrated strategies to control E. heterophylla and to inhibit the evolution of new herbicide-resistant strains. 相似文献
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C. C. Dipp J. A. Marchese L. G. Woyann M. A. Bosse M. H. Roman D. R. Gobatto F. Paludo K. Fedrigo K. K. Kovali T. Finatto 《Euphytica》2017,213(5):102
Drought stress on reproductive stages constitute a major problem for common bean (Phaseolus vulgaris L.) production because it affects flowering and pod-filling processes which are highly drought-sensitive. In this study, we used a greenhouse experiment to evaluate the response to drought stress in ten highly cultivated Brazilian genotypes in response to moderate intermittent drought during flowering and pod-filling periods (R7 and R8 stages). Morphological, biochemical, physiological and agronomic traits were used to identify tolerant cultivars and elucidate their strategies to cope this stress. The drought intensity index for the experiment reached 0.63. The cultivar IAC Imperador can be defined as a tolerant cultivar, presenting the lowest grain yield reduction (43%) and a reduced drought susceptibility index (0.65). This cultivar elevated their level of proline in roots under stress, which allowed the osmotic adjustment and the maintenance of an intermediate stomata closure during the day, which maintained the intrinsic WUE stable in NS and DS conditions. In addition, this cultivar was able to mobilize the assimilated carbon for the production of pods and grains, evidenced by the high harvest index and the high grain filling index. In this way, IAC Imperador can be used as a check in breeding programs to identify and select lineages with drought tolerance in common bean. 相似文献
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